<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            #d1{
                width: 200px;
                height: 200px;
                background-color: red;
                display: none;
            }

            #s1{
                width: 200px;
                height: 200px;
                background-color: blue;
                display: block;
            }
        </style>
    </head>
    <body>
        <div id="d1">hello</div>
        <span id="s1">hello</span>
    </body>
</html>